linux-kernel - Re: [PATCH V6 1/2] remoteproc: introduce rproc features

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Date:   Mon, 4 Jul 2022 16:55:05 +0200
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        <bjorn.andersson@...aro.org>, <mathieu.poirier@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Peng Fan <peng.fan@....com>
Subject: Re: [PATCH V6 1/2] remoteproc: introduce rproc features

Hello,

On 7/1/22 11:37, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> remote processor may support:
>  - firmware recovery with help from main processor
>  - self recovery without help from main processor
>  - iommu
>  - etc
> 
> Introduce rproc features could simplify code to avoid adding more bool
> flags
> 
> Signed-off-by: Peng Fan <peng.fan@....com>
> ---
>  drivers/remoteproc/remoteproc_internal.h | 15 +++++++++++++++
>  include/linux/remoteproc.h               | 15 +++++++++++++++
>  2 files changed, 30 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_internal.h b/drivers/remoteproc/remoteproc_internal.h
> index 72d4d3d7d94d..82247cb5d0c2 100644
> --- a/drivers/remoteproc/remoteproc_internal.h
> +++ b/drivers/remoteproc/remoteproc_internal.h
> @@ -24,6 +24,21 @@ struct rproc_debug_trace {
>  	struct rproc_mem_entry trace_mem;
>  };
>  
> +static inline bool rproc_has_feature(struct rproc *rproc, unsigned int feature)
> +{
> +	return test_bit(feature, rproc->features);
> +}
> +
> +static inline int rproc_set_feature(struct rproc *rproc, unsigned int feature)
> +{
> +	if (feature >= RPROC_MAX_FEATURES)
> +		return -EINVAL;
> +
> +	set_bit(feature, rproc->features);
> +
> +	return 0;
> +}
> +
>  /* from remoteproc_core.c */
>  void rproc_release(struct kref *kref);
>  irqreturn_t rproc_vq_interrupt(struct rproc *rproc, int vq_id);
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index aea79c77db0f..bbfb3affff32 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -489,6 +489,19 @@ struct rproc_dump_segment {
>  	loff_t offset;
>  };
>  
> +/**
> + * enum rproc_features - features supported
> + *
> + * @RPROC_FEAT_ATTACH_ON_RECOVERY: remote processor no need help from Linux
> + *                                 to recover, such as firmware loading.
typo: 
s/remote processor no need/ The remote processor does not need/

> + *                                 Linux just need to attach after recovery.
typo 
s/need/needs/

Regards,
Arnaud

> + */
> +
> +enum rproc_features {
> +	RPROC_FEAT_ATTACH_ON_RECOVERY,
> +	RPROC_MAX_FEATURES,
> +};
> +
>  /**
>   * struct rproc - represents a physical remote processor device
>   * @node: list node of this rproc object
> @@ -530,6 +543,7 @@ struct rproc_dump_segment {
>   * @elf_machine: firmware ELF machine
>   * @cdev: character device of the rproc
>   * @cdev_put_on_release: flag to indicate if remoteproc should be shutdown on @char_dev release
> + * @features: indicate remoteproc features
>   */
>  struct rproc {
>  	struct list_head node;
> @@ -570,6 +584,7 @@ struct rproc {
>  	u16 elf_machine;
>  	struct cdev cdev;
>  	bool cdev_put_on_release;
> +	DECLARE_BITMAP(features, RPROC_MAX_FEATURES);
>  };
>  
>  /**